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| Core Java - Interview Questions and Answers for 'Static variable' - 7 question(s) found - Order By Newest | ||||
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| Ans. Advantages Can do meta object operations ( like validating something before creating objects , keep count of number of objects ) Can do operations which have nothing to do with objects but still you want them to be tied to Class. Disadvantages Commonly used to static variables sometime leads to problems due to access by different objects. Are not tied to objects so doesn't reflect pure Object Oriented approach. Needs to be synchronized so as to avoid update conflicts by mutiple objects and threads. Some limitation in testing as not all frameworks have facility to mock them. Powermock has but Mockito doesnt | ||||
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 Discuss Correct / Improve  java static static variables static methods | ||||
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| Ans. They are loaded at runtime when the respective Class is loaded. | ||||
 Sample Code for static variable | ||||
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Discuss Correct / Improve java oops static static variable memory  intermediate | ||||
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| Ans. No. Only Object and its members are serialized. Static variables are shared variables and doesn't correspond to a specific object. | ||||
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Discuss Correct / Improve serialization java oops static static variables  Asked in 1 Companies intermediate  rare | ||||
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| Ans. It is a class level variable that is shared among the objects of that class. | ||||
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| Discuss Correct / Improve static static variables class level variables Asked in 1 Companies basic frequent | ||||
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| Ans. static methods and static elements are shared by all objects of a class and hence could create problem. Static methods are not synchronized by default and hence could create problem when accessed through multiple threads. Static elements are shareable by class and hence state of one object could be altered by another object. Some limitations with Unit testing as not all mocking framework facilitate mocking them. Power mock allows but Mockito doesn't | ||||
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| Discuss Correct / Improve static static method static variables | ||||
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| Ans. Cloneable and Serializable are Marker Interfaces, So these are empty interfaces with no variables. | ||||
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| Discuss Correct / Improve cloneable serializable static variables Asked in 1 Companies | ||||
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| Ans. Yes the value of a static variable can be changed. It's the final keyword that restrict the modification of value not static. | ||||
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| Discuss Correct / Improve static variables | ||||
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